Sanitize the representation of formula
authorKim Nguyễn <kn@lri.fr>
Wed, 17 Jul 2013 15:59:01 +0000 (17:59 +0200)
committerKim Nguyễn <kn@lri.fr>
Wed, 17 Jul 2013 16:21:25 +0000 (18:21 +0200)
- rename the toplevel Formula module to Boolean
- rename Ata.SFormula to Formula
- move the flag saying whether an atom is positive or negative
  to Boolean
- distinguish predicates that are moves from generic predicates.


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